Pen case



FIG. 1 is a perspective view of pen case showing my new design;

FIG. 2 is a side view of the pen case;

FIG. 3 is a top plan view of the pen case;

FIG. 4 is a bottom plan view of the pen case; and,

FIG. 5 is another perspective view of the pen case. 

The ornamental design for the pen case, as shown and described. 